Acapillary is:
a large artery which takes oxygenated blood to the body’s cells
a tiny blood vessel found surrounding alveoli in the lungs
a large vein which brings blood without oxygen to the heart

when you rub, you also apply pressure, that pressure can urge the poop to come out. i think that when your rubbing, you also might be slightly breaking it up and that can further fill the stomach.  

poison her by building up too much vitamin k in her body or cause hair loss and a severe case of acne